Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ec2efb9654ecdabce4ad0f6b6844d073d6ddcf01cab72970dd90f6235f66563' 
  AND token = 'w6q1zlNe3/DkgrCTsTeY8nl4r/KEZ7RT+pA4Smpiue0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}